API User Token Status
Get the details of a user's auth status
- "api_service" (string - API service name as you called it when adding it to ProcFu on the account page)
- "user_id" (string - some internal reference for the user that you'll use in future calls for this user)
JSON object with auth_token (true/false) and last_save (date of last refresh)
NB: Don't forget to set your headers and use POST (not GET) for the arguments !!!